What I mean is, your phone is manufactured somewhere and it makes some amount of pollution. If we all buy a new phone every time we see something new come out, there will not be many generations after us.

That makes absolutely no sense. You don't buy every phone there is to buy on the market, and making a phone is not as bad as, say, driving a car or generating electricity or even eating meat. Should everyone stop these things, too? Should people in Africa stop them, too? They consume far less than Americans do, but they may also use things that are worse for the environment (old, dirty cars, burning down forests for grazing land, etc.). Are you in favor of some type of built-in pollution tax on goods? I don't see exactly what you are getting at here.

I agree, I do believe it will have to be based on human nature. It can't work any other way. I would just want to have it based on something else than greed. Greed is part of the bad things in human nature. It could as well be based on something positive.

All systems based off of human nature are based off of what humans do on DEFAULT.

Every single human wants their needs and wants fulfilled. To that end, he is willing to sacrifice something (his time) in order to do something such that he could have money (aka he produces) so as to get his needs and wants fulfilled.

And that is capitalism. Plain and simple. It goes by the most basic foundations of human nature, which is self-interest. Self-interest is why communism fails and capitalism works.

Every single human wants their needs and wants fulfilled. To that end, he is willing to sacrifice something (his time) in order to do something such that he could have money (aka he produces) so as to get his needs and wants fulfilled.

And that is capitalism. Plain and simple. It goes by the most basic foundations of human nature, which is self-interest. Self-interest is why communism fails and capitalism works.

I agree with every word here. But you haven't convinced me that greed is the only possible basis for a system of our age.

Why? Wanting more things (or an easier, less strenuous life) makes people get up and work. That is a good thing.

Easy and less strenuous life would be to work less and be happy with food on the table and some friends and hobbies... They don't necessarily have to bring the apocalypse any closer. Buying stuff does.

Greed--you want something. So you work for it.
Pride--You want to be proud of yourself. So you work to develop a reputation.
Sloth--You want to do whatever it is you want to do with your time. So you work to make enough money such that you're in control of your life.
Lust--You want a beautiful significant other to make love to. So you in turn strive to be beautiful. This takes work.
Envy--You want what someone else has. So you work to get something like it.
Gluttony--You want to consume things. Whether it's expensive wines, or just go out to eat a little more, you work for that also.

All of these cardinal "sins", except Wrath--are what humans are at the basic level. Selfish. They want things for themselves, be it money or sex or possessions or tasty food, and will go to great lengths to achieve them. So in order to fulfill their "unlimited" wants, they go out and produce that which other people find a use for.